Thousands have attended the funeral of an unarmed police officer killed with her colleague in a gun and grenade attack in the English city of Manchester.

Members of the public emerged from offices and stores to line the streets as the funeral cortege of 23-year-old Nicola Hughes passed on its way to Manchester Cathedral.

Greater Manchester Police chief constable Peter Fahy told 1,000 mourners inside the building that Hughes' professionalism had "showed that policing is not about muscle but reason, restraint and intelligence."

Hundreds more people watched on a big screen outside.

Hughes and fellow officer Fiona Bone died while answering a burglary call on Sept. 18. A man has been charged with their murder.

The crime shocked Britain, where guns are tightly controlled and most police do not carry firearms.